Gold futures climb toward $645 an ounce

SAN FRANCISCO (MarketWatch) -- February gold was last up $9 at $643.10 an ounce after touching a high of $644.30. The contract was trading at its strongest intraday level since Jan. 3, lifted by weakness in the dollar as well as strength in oil prices. March silver was up 22.5 cents, or 1.7%, at $13.225 an ounce and March copper traded at $2.572 a pound, up 4.25 cents.

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